void mainImage(out vec4 fragColor, in vec2 fragCoord)
{
    vec2 uv = fragCoord.xy / iResolution.xy;

    vec2 left = uv;
    vec2 right = uv;

    vec3 color = vec3(0.02, 0.04, 0.08);

    if (uv.x < 0.5) {
        vec2 p = left * 2.0 - 1.0;
        p.x += 0.5;

        float circle = smoothstep(0.32, 0.30, length(p));
        color += circle * vec3(1.0, 0.25, 0.18);
    } else {
        vec2 p = right * 2.0 - 1.0;
        p.x -= 0.5;
        p.x *= iResolution.x / iResolution.y;

        float circle = smoothstep(0.32, 0.30, length(p));
        color += circle * vec3(0.1, 0.7, 1.0);
    }

    float divider = 1.0 - smoothstep(0.0, 0.004, abs(uv.x - 0.5));
    color += divider * vec3(0.8);

    fragColor = vec4(color, 1.0);
}